When you’re building (and updating) a software product for release, it’s important that the version number is adjusted as you add features and fix bugs. Your users need to know if the code they have is out of date, and the easiest way for them to tell is to compare version numbers. You can manually update version, revision, and build numbers in Visual Studio each time you make a change to your application, but that can get inefficient (and annoying) very quickly. Throw WiX into the equation, and you’ve got a couple more places to change the version number...